Dry-kiln.



H. n. iEMANN L N. DE w. BEUS.

DRY KILN.

` APPLICATION FILED A PR.6. 1911.

Patented Aug. 20, 191s.

Mlllllrll! j To all whom z't may concern:

UNITED STATES PATENT oEEioE.

HA-BRY DONALD TIEMANN, F MADISON, WISCONSIN, AND NORMN DE WITT BETTS, 0F

LINWOOD, UTAH, ASSIGNORS, BY -TI`IE UNITED STATES AND T0 THE Be itknoWn that We, HARRY DONALD 1 TLEMANN, a citizen ot `the United States of of Dane, State of Wisconsin,

i States' without of they .said United States,

Vvvood, in thecou-nty of Uinta,

' (Whose post-olii ce address is Linwood, Utah,)

-'Aine'rica, 'and an employee of the Department -of Agriculture of the said United States, residing'at hfadison, in the county (whose post` oHice address isM'adison, Tisconsin,) and i, NonMAN'nnlVITr BE'TTs, a citizen` of the 10.

United States ofiAmerica, and formerly an employee of the Department of Agriculture residing at Lin- State of Utah,

have invented a new and useful Improvement in Dry-Kilns.

This application is made under the act of March, 188,3, chapter 143 (22 Stat.` 625), and the invention herein described and claimed may be used by the Government of the United States or any of its oiicers or employees ingtheprosecution ofwork for the Government or any person in the United paymentto usof any roy` alty thereon.

i lumber or other moisture-bearing substances.

. other moisture-bearing The object of our invention is to provide a'. dry kiln simplein construction and Veasy of operation, and one that will permit of uniform andrapid drying Vof lumber, or substances,.by means of superhe'ated steam.

The. featuresof ou r invention are (1) the method Aof securing the proper amount and direction of circulation, f (2) the use of a much lower temperature of the superheated steam, and. (3) the means of modifying the dryness of the is to be dried.

The object, characteristic features, Vand scope of our invention will be more readily understoodyrom the following description the sides and taken in connection with the accompanying drawin `wherein:

The gure 1s a transverse sectional View Specification of Letters Patent:

g "f obtained Our invention relates to kilns for drying medium in v vhich the lumber represents 13.. the roof, C, andthe floor D.

nity-mmf.

(DEDICATED To THE runningexhaustin the excess steam to ythe air through t e outlets,` E. The recirculating flue, is separated from the drying room proper by partition, G. The heating device is shown at,'H, and I, designates the steam inlet. The stack of lumber, J, is shown piled verticallyland across the kiln, this being a convenient method of taking advantage of thefull effect of thc circulationbut other methods of piling known to the trade may be used.

By securing the, heating device',` H, to `the side walls,-

below the said heating device, as shown in the drawing, the steam supplied to the kiln' PatentedAug. 20, 1918. I Application filed April 6, 1917. Serial No.`160,332. I

, and `locating theV steam jets, I,

. through vthe j.ets,-I, becomes superheated While in course, of rising-to the top of the kiln through nthefllue, F.' This arrangement of the-heating device, H, and steam jets, l, induces the escaping steam to pass rapidly through the recirculating flue, F, thereby producing a largecirculation in the fdrying chamber. This method of heating thesteain is preferable, but good results may also be to. heating the steam in` kilns where theheating pipes are located below the lumber by arranging'the steam `jets below. such heating pipes thereby causing ,rapid vertical lcirculation of the superheated steam. A

The invention applies "tery of kilns as ber type. Il.. practising .i'nitted to the drying chamber, A, through' the inlet, I, which should preferably consist of small openings on the side'next to, the heating device, H. This will produce a jet action and .vill cause a rapid circulation of Isteam up` through the Hue, F, and down through the lumber. The steam Will, upon iste-udma'` through the heated to a degree controlled by the ad# justment between the our invention, steam is"adliuc, F,Ibecome superamount ofstea'm jetted into the kiln and the temperature' ofthe j .heating device. heated'condition of. the Steam, the lumber is possible, `the amount of superheat Un account of the superandthe .control f allows the necessary vcontrol of the rateof drying. The action of Vthe steam in giving avery fast circulation .and.at the.snme time acting as the drying ,drying of i roo,

2 l imitan' medium makes the yoperation of the kiln very sim-ple. Furthermore, the' nature of this dryinnr medium, cn'aecount of its lack of oxygen, makes the possibility of re in 5 the kiln vcrr remote and thus avoids an ever present danger to kilns using air at a high temperature.

F rom the foregoing, it is thought that the construction, operation and many advan- 10 tages of the herein described inventionvvill ing 'thfecirculating medium, and a steam, in e t situated adjacent to the heating deyice so thatthe escaping steam will pass rapidly through the recirculating flue, thereby 1nducing a largev circulation inv the drying chamber and at the same time become superheated.

S0 2. A dry kiln including a drying chamber, a' heating device adjacent to a Wall thereof, and an inlet for steam situated adjacent to the heating device so that the action of the steam in escaping will cause rapid circulation along the Walls and through the drying chamber and at the saine time permit the steam to besuperheated.

A dry lkiln including a. drying chainber, a heating device adjacent toja wall thereof, and an. inlet for steam situated adjacent to the heating dev1ce,'so that the action ofthe escaping steam will cause rapid circulation through the lumber and at the same time the steam4 will become superheated b means of the heatin device. l 4i.` A ry kiln including a ber, .a heating device a jac 4 thereof, and aninlet for steam situated adjacent; to the heating device so that' the action'of the escaping steam willv causerapid circulation through' the lumber .andat the same time the steam willi `become. superheated by means ci the heating device','and thus'furnish a medium for drying the lum- Yber that excludes the air necessary forcembution and therefore eliminates the possibility of fire during the drying process.v

5. -A dry kiln including a drying-chamber, a heating device adjacent to a wall` thereof, and an inlet for. steam situated adjacent to the heating device, so 'that' the action of the escaping steam will 'cause rapid circulationthrcugh 'the lumberl and .at the same time thesteam will become superlieated by means ofthe heating device.

Intestimony whereo we ailix our signatureS', in the presence of the subscribing wit- HARRY DONALD TIEMANN.

NORMAN nn WITT BETTS.

Witnesses:

ALFRED W. Domi, CRAs. P. JUcxnM, Gao. C. Raenmssiirr,y KEITH SMITH. 

